Basic esters of i-benzoxacycloalkane-



3,103,515 BASIC ESTERS 6F l-BENZQXAfiYCLQALKANE- CARBOXYLIIJ ACIDS Harold Elmer Zaugg, Lake Forest, Robert William De Net, Waukegan, and Raymond John Michaels, Jun, Mundelein, IlL, assignors to Abbott Laboratories, Chicago, IlL, a corporation of lllinois No Drawing. Filed June 8, 1961, Ser. No. 115,60:

15 Claims. ((311. 260--292) This invention is concerned with new and novel basic esters of 1-benzoxacycloalkanecarboxylic acids of the formula COXR and methods for their preparation. In this and succeeding formulae, n is 1, 2 or 3, X is oxygen or sulfur and R is one of the following radicals:

CHzCHzN(C2Hs)z CH2CH2N(CH3)2 CHzCH2N[CH(CHa)2]z -CH (CH3) CHzN (C1192 I CH3 and ' toxic, pharmaceutical, liquid or solid carrier.

use, the compounds can be employed orally, intravenous-1y or intramuscularl y alone or in the Eform of tablets, solutions, suspensions or emulsions admixed with a non- In representative operations, a 1% aqueous saline solution of {3- diethylarninoethyl 5-phenyl-2,3,4,5-tetrahydro-l-benzoxepin-5-carboxylate injected adjacent to the sciatic nerve of a guinea pig produced nerve block causing sensory anesthesia to a portion of the pigs leg for over three hours. In another test, an intravenous injection of an aqueous saline solution of (1-methy1-3-piperidylmethyl) 3-phenyl-2,3-dihydro-3-benzofunancarboxylate in cats at a dosage of 25 mg. per kg. of body weight produced an immediate marked drop in blood pressure.

The compounds wherein X is oxygen are prepared by the reaction of a compound of the formula MOR wherein M represents hydrogen or an alkali metal, preferably sodium or potassium, With a compound of the formula (0 Hz) n-Hal wherein Hal represents chlorine or bromine. Good results are obtained when equimolecular proportions of both reactants are employed and the reaction is carried out in the presence of a hydrohalide acceptor such as triethylamine, pyridine and the like. The reaction takes place smoothly from room temperature to the boiling temperature of the reaction mixture. In general, steam bath temperature is sufiicient to complete the reaction. The desired product is readily isolated by filtering the reaction mixture, concentrating the filtrate to dryness, dissolving the dry residue in ether and adding a slight excess of ethereal hydrogen chloride to precipitate the HCl salt which is thereafter recrystallized from a suitable organic solvent. Basic esters which do not form crystalline hydrochlorides are isolated either by vacuum distillation or by crystallization as the free base.

The compounds wherein X is sulfur are best prepared by the reaction of equimolecular proportions of a compound of the formula RSI-I and a compound of the formula COCI in the presence of a hydrohalide acceptor such as triethylarnine at from room temperature to the boiling temperature of the reaction mixture. The desired product is isolated in the 01m of the free base or as an acidaddition salt, preferably as the hydrochloride, in the same manner as that described in the preceding paragraph.

The following examples and procedures illustrate methods for preparing the new compounds but are not to be construed as limiting the invention to the exact proportions or steps employed 1l1erein.

PROCEDURE 1 A mixture of 12.1 g. (0.04 mole) of 3-bromomethyl- 3-phenyl-2-benzofuranone, 4.7 g. (0.04 mole) of fi-dimixture was filtered to remove triet-hylamine hydrochloride and the filtrate was concentrated to dryness under 21. mole} of triethyla-mine in 75 ml. of dry 1,2-din1ethoxyethane. The temperature rose spontaneously to 33 C. and an insoluble salt formed. After the exothermic reaction stopped, the mixture was stirred and warmed at reduced pressure. The residue was taken up in ether, 50 C. for 3 hours and thereafter stirred overnight at Washed with Water and dried over anhydrous magnesium room temperature. The insoluble salt was removed by sulfate. Filtration and removal of the ether by evapora- I filtration and the filtrate concentrated to dryness under tion gave 11.2 g. (84% yield) of crude fl-diethylaminoreduced pressure. The residue was treated with 100 ml. ethyl 3 phenyl 2,3 dihydro-3-benzofurancarboxylate of cold water and processed as described in Procedure 1 which was redissolved in dry ether and treated with a to obtain the hydrochloride salt of fl-diethylannnoethyl 3- slight excess of ethereal hydrogen chloride. The prephenyl 2,3 dihydro 3 benzofurancarboxylate which cipitated HCl salt after recrystallization from Z-butanonemelted at 125l27 C. 251 135 2 231: the th elrei icsl sal e i 3 hinti PROCEDURE 4 g p g A 301011011 of 9.2 g. 0.032 mole) of 5-pheny1-2,3,4,5- PROCEDURE 2 tetrahydro-1-benzoxepin-5-carboxy1yl chloride, 3.74 g. To 3 grams (0.026 mole) of fi-diethylaminoethanol in f B-Cliethyhminoethanol and 3.3 g. (0.032 15 m1. of 1 ,2-dimethoxyethane was added portionwise mole) of tnethyl'amme m 150 offiry benzene was 125 (0.026 mole) of a 50% mineral oil Suspension f fluxed for 16 hours. The reaction mixture was thereafter Sodium hydride at a temperature f 50 C Afte gas 20 processed as described in Procedure 1 to obtain the hyevolution ceased, the mixture was cooled to room temdl'ochlorlde Salt of B-F y y -P Y Pemturc and .00 5 mole) f 3 l) tetrahydro-1-benzoXepm-S-carboXylate melting at 194 3-phenyl-2-benzofuranone was added portionwise with stirring. After standing overnight, the reaction mixture PROCEDURE 5 was treated with 100 ml. of cold 'Water and processed as 5 To a solution of 9.6 g. (0.04 mole) of the acid ch10- described in Procedure 1 to obtain the hydrochloride ride of 3-phenyl-2,3-dihydro3-benzofurancarboxylic acid salt of fi-diethylarninoethyl 5-phenyl-2,3,4,S-tetrahydroin ml. of triethylamine was added with stirring 4.6 g. 1-benzoxepin-5-carboxylate melting at 193l94 C. This (0. 04 mole) of 4-hydroxy-l-methylpiperidine. The mixsalt contained 3.44% nitrogen which agreed with the calture was stirred for 3 hours at room temperature and then cul'ated value for nitrogen. 30 allowed to stand overnight. After heating for one hour PROCEDURE 3 on the steam bath, the cooled reaction mixture was treated with 50 ml. of cold water, extracted with ether and A SOIHtIOIl 0f g- 1 of 'P' Y 'l crystallized to obtain the desined (l-methyl-4 piperidyl) Y Q- Y acid and mole) 3pheny1-2,3-dihydro-3-benzofurancarboxylate as the free of thlonyl chloride 111 25 1111- (if Y Was refluxed base melting at 103 104 C. This base contained 4.19% for two hour? The eXCeSS t111011311 Chloride and benzene nitrogen as compared to the theoretical value of 4.15%. was removed by distillation under reduced pressure. The other estm-s wherein X :i Oxygen i h general f l r si l a dissolved in 25 of y L ywere prepared from the appropriate starting materials acethane and added dropwise to a stirred solution of 2.6 gcording to the foregoing procedures as shown in the fol- (0.022 mole) of ,8-dietl1ylami11oethano1 and 3 g. (0.03 lowing table.

Table I Percent nitrogen 11 Equals- R equals- Procedure 13.1. or M.P.* in

degrees 0.

Calculated Found 1 151-152* 4.03 4.05 }GHzCE2N(CH3)z-HCI 1 212-213* 3.87 3.33 4 214-215* 3.64 3.79

1 193 at 1 mm 3. 31 3. rCH2CH2N[CH(CHa)2]2 1 158-159* (H01 salt). 3. 35 3.39 4 135-136* (H01 salt) 3.24 3.30 1 201 at 1.2 mm 4.15 3. CH2CH2N 1 212 at 1.4 mm 3. 99 3. 79 4 203-206* (H01 salt) 3.41 3.40

1 143-149* 3.61 3. s4 }-CH2CH2N HC1 1 159160* 3.43 3. 43 4 203-204* 3.30 3.10

1 231-232* 6.38 6.36 OH4CH2N N-CHHHCI 1 233-239* 6.13 6.12 4 242-244* 5. 99 5. 01

2 1s7-1s3* 3.87 3.35 }CH2(CH3)CHzN(CH3)z-HC1 2 197 21121.6 mm (base) 4.13 4.10 4 200-201* 3.59 3.59 2 200 11.1 3. }CH(CH3)CH N 2 202211113 3 3. 3 4 199200*(HClsalt) 3.37 3.36 8 2 atlmm 3.33 3.91 }-OH(CH3)GH2N 2 207 at 1.5 3. 69 3, 4 218220*(H0lsalt). 3.25 3.05 2 203 11.4 3. }CH(CH )CH2N 2 216 211.6% 4 223-224* 01013310-." 3.15 3.13

I 1 216 5.31.3 3.33 3.91 1 227 at 1.3 mm 3. 69 3. 00 CHzCHg 4 226atlmm 3.55 3.60

N (EH3 Table 1-Continued Percent nitrogen 11 q S- R equals- Procedure B.P. or M.P.* in

. degrees 0.

Calculated Found 1 3.99 3. 95 l 208at1m111 3.83 3.85 4 233-234 (H01 salt)- 3. 37 3. 30 T CH3 2 90-91* 4.15 4.15 NCH:', 2 181 at 2 mm 3. 99 3. 89 4 211212* (H01 salt) 3. 48 3. 32

orn-orr-om 2 9798* 3. 85 3. 71 N-CHa CH- y 2 175177* (H01 salt) 3.38 3.18 I 4 129130* 3. 57 3. 50 CHr-OH-CHB CH2CH2N(C2H5)z-HC1 1 157158* 3. 59 3. 40

l3 Diethylaminoethyl 3 phenyl 2,3 dihydro 3 benzofurancarboth-iolate was prepared 'by the reaction of 9.6 g. (0.04 mole) of the acid chloride of 3-phenyl-2,3- dihydro-3-benzofurancarboxylic acid and 6.6 g. (0.04 mole) of S-diethylaminoethanethiol according to the method described in Procedure 5. The thiol ester was obtained as a light yellow oil boiling at l88-189 C. at 1 mm. and upon analysis was found to contain 4.12% nitrogen compared to the calculated value of 3.94% nitrogen.

By substituting B-diethylaminoethanethiol for the 8- diethylamin oethanol in Procedure 4, the hydrochloride salt of fi-diethylaminoethyl -phenyl-2,3,4,5-tetrahydro-lenzoxepin-S-oarbothiolate was obtained as a crystalline solid melting at 165 466 C. It contained 3.33% nitrogen which corresponded to the calculated value for nitrogen.

The 3-ha1oa1kyl-3-p-henyl-2-benzofuranones employed as one of the starting materials in the present invention are prepared by the reaction of equirnolecular proportions of an alkali metal derivative of 3-pheny1-2benzouranone and a dihaloalkane of the formula X-(CH -X wherein each X is chlorine or bromine in inert organic solvent such as benzene or dimethylforrnamide at from about 0 C. to the reflux temperature of the reaction mixture. Upon completion of the reaction, the alkali metal halide which precipitates is removed by the presence of an filtration, the filtrate is concentrated and the residue is distilled or crystallized from a suitable solvent to obtain the desired product as a mobile liquid or crystalline solid.

The carboxylic acidsemployed as starting materials.

are prepared by reacting the 3-haloalky1-3-phenyl-2-benzofuranones with an alkali metal hydroxide in an aqueous medium at from room temperature to the reflux temperatrue of the reaction mixture. When the reaction is complete, .the mixture is ac'dified to precipitate the desired product which is thereafter crystallized from a suitable organic solvent. The corresponding carboxylyl chlorides are prepared by refluxing the appropriate carboxylic acid with an excess of thionyl chloride in benzene and thereafter removing the benzene by distillation under reduced pressure.

What is claimed is: Y 1. A member of the group consisting of a compound of the formula O\ /CH2)u o OOXR and R is a radical selected from the group consisting of -onzornN I CH p and the non-toxic, pharmacologizoally acceptable, acidaddition salts thereof.

2. A compound of the formula CH2 i:\

COOR

wherein R is diloweralkylaminoethyl.

3. A compound of the formula COOR wherein R is diloweralkylaminoethyl.

4. A compound of the formula wherein R is diloweralkylaminoethyl.

l0 and 5. fi-Diethylaminoethyl 3-phenyl-2,3-dihydro-3-benzo furancarboxylate.

6. ,B-Diethylaminoethyl 4-phenyl-4-chrornancarboxylat wherein n is a whole number from 1 to 3 inclusive and 7. ,B-Diethylaminoethyl S-phenyl-Z,3,4,5-tetrahydro-1- Hal is a halogen selected from the group consls'llng 0f benzoxepin-S-carboxylatg chlorine and bromine with a compound of the formula b 8. ,8 Ripejridinjoethf l 5 phenyl-2,3,4,5-tetrahydro 1- 3O MOR enzoxe in- -car oXy ate. 7

filgyrrolidmoethyl 3 pheny1 2 3 dihydro 3 benzofur wherein M 1s selected from the group consistmg of hyancarboxylate drogen and an alkali metal and R is a radical selected (1 methy1 3 piperidy1methy1) 4 phenyl 4 chmman from the group previously defined 1n the presence of carboxykua 35 a hydrohalide acceptor at from room temperature to the 11. ,6-Diethylarninoethyl 5-phenyl-2,3,4,5

benzoXepin-5-carbothio1ate.

12. A method for the preparation of a compound of the formula (CHDD COOR -CH(CH3) oHm CH(GHa) CH2N CH(CH:4) CHzN tetrahydro 1 bollmg temperature of the reaction mixture and recovering the resulting product.

13. A compound of the formula 14. A compound of the formula 15. A compound of the formula References Cited in the file of this patent UNITED STATES PATENTS 75 2,901,507 Specter et a1. Aug. 25, 1959 

1. A MEMBER OF THE GROUP CONSISTING OF A COMPOUND OF THE FORMULA
 13. A COMPOUND OF THE FORMULA
 13. A COMPOUND OF THE FORMULA 3-(H5C6-),3-(8-(H3C-)NORTROPAN-3-YL-)-DIHYDROBENZOFURAN 